I will second this - give the power to the user to make Teams their own. We should always be defaulting to letting the user arrange and place things in the interface as they see fit. Apologies to the help/documentation team as this will make their job harder, but this is the world we live in now. One size fits all is one size fits none!

Teams Pinned Channels Highlight Favorite Discussions

Highlight Important Channels Above Teams List

"Office 365 Notification MC190856 brings the news that Teams supports the ability to “pin” channels to the top of the Teams list. The new feature is described inOffice 365 roadmap item 55369. The new feature is now rolling out to Office 365 tenants and Microsoft says that the deployment will be complete worldwide by the end of October 2019."